Abstract

Excavations at site U.C.L.J.-M-15 at Agua Hedionda Lagoon in southern California have provided a radiocarbon date of 7070 B.C. for a transitional phase between the San Dieguito and the La Jolla complex. The many radiocarbon dates taken from sites in San Diego County demonstrate a somewhat greater age than was hitherto generally expected for the three cultures in the area. The age of the most recent culture, the Yuman-Diegueno, has been extended to about 1000 B.C. The La Jolla shows an extremely long period of occupation spanning roughly 1000 B.C. to 7070 B.C. The third group, the San Dieguito, a pre-Desert culture, is still undated. Samples are now in process and should, judged from the new La Jolla dates, give a date earlier than 7000 B.C. for the earliest phases of the San Dieguito.